194 Mr. F. A. Bather on British Fossil Crinoids : 
ray may be so branched no less than the others. It is to be 
hoped that more specimens of this species may be found, so 
that this question may be settled; for it is very remarkable 
that the same species should combine such regularity in the 
pinnules with irregularity in the armi-branching. 
The anterior side of the Ventral Sac is partly exposed in 
the proximal region, and is composed of small plates, which, 
like the covering-plates, seem to run without distinction into 
those of the Tegmen. Where the plates are disturbed, traces 
of an articular facet can be distinguished on their upper sides, 
corresponding to the ridge. (Fig. 2.) 
The Stem is pentagonal or slightly quinquelobate, the lobes 
being interradial in position, while the radial sutures are seen 
to run down the depressions between them. ‘The ossicles are 
all ridged, but alternate in size. The width of the stem is 
3°2 millim. and the average height of the ossicles is °36 
millim, (Fig. 1.) 
Compared with the stem of B. qguinquelobus, that of the 
present species is seen to be proportionally more slender and 
less lobate. All the ossicles, instead of only alternate ones, 
are ridged, while the ridges are more obvious in the depres- 
sions and are of a finer appearance. 
The Horizon of the present specimen is more compatible 
with its stage of development than that to which the type 
specimen was, perhaps erroneously, assigned. 
EXPLANATION OF PLATE XI. 
Botryocrinus quinquelobus, sp. 0. 
Fig. 1. a/485, Woodwardian Museum, No. 1. Seen from anterior; with 
drawing of transverse section of the stem. Nat. size. 
Fig. 2. a/485, Woodwardian Museum, No. 2. Seen from anterior. Nat. 
size. 
Mastigocrinus loreus, gen. et sp. 0. 
Fig. 3. a/493, Woodwardian Museum. (Cyathocrinus arboreus, Salter, 
Cat.) Seen from right posterior interradius. Nat. size. 
All figures on this Plate are from drawings by Mr. EH, Wilson, Artist 
to the Cambridge Engraving Co. 
XXXI.— British Fossil Crinoids.—V 11. Mastigocrinus loreus, 
nov. gen. et sp., Wenlock Limestone, Dudley. By F. A. 
BaTHER, M.A., F.G.S. 
[Plate XI. fig. 3, and Plate XIL.] 
Tue form described in this paper appears to belong to the 
family Dendrocrinide, series Dendrocrinites. It should 
therefore have been considered betore the Botryoerinites, 
